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Thread: How do I get input from a "3rd party" guage ? to obd ?

  1. #1
    Maximum Bitrate SAScooby's Avatar
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    How do I get input from a "3rd party" guage ? to obd ?

    Hi all

    Please help I am busy installing a carputer in a car with an aftermarket turbo conversion, so the OBD interface doesnt know about the boost pressure, how do I create a "gauge" to show this info ?

    I am thinking of a MAP sensor to measure boost electrically, ie resistance changes as boost changes, now I need to get it into the pc so I am sure I need a serial / usb interface and then some software to interpret the information and then it needs to be displayed as a gauge so now how do I do this ?

    I found a phidget pressure sensor and am just waiting to hear if it is able to display vacuum as well, but that only helps with half the problem ! !

    HELP
    Nano ITX / 512 MB / 60 GB / Panasonic slot load / M1-ATX / Bu303 / Sound blaster 24 / PPi amps / rockford sub

  2. #2
    Constant Bitrate
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    One way (there are many) is to use a Map sensor tied to a 1-wire device (voltage) tied to a USB or serial 1-wire adapter. This will get the data into the PC. Then, you will need to get software to grab that data and display it.

    Once you have the 1-wire network, you can add 1-wire devices for temp, pressure, and tons of other usages. They are cheap and easy to wire. The software side will be the complicated part...

    http://www.maxim-ic.com/1-Wire.cfm

  3. #3
    Maximum Bitrate Danceheaven's Avatar
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    An A-D card also known as ADC (analouge to digital converter) or DAQ (data aquistion card) many ways software is the fun part, ricky327 is designing a relay card with analouge inputs this card could be used for such a project go see hes thread on serial relay control
    Co Develper of A.I.M.E.E Automotive Intelligent Multimedia Entertainment Engine
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  4. #4
    Maximum Bitrate SAScooby's Avatar
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    Thanks for the solutions !

    Are any other ideas easier than these ! ! these look like re inventing the wheel ! ! I was hoping it would be easier than this ! and I thought getting the power right was tough !
    Nano ITX / 512 MB / 60 GB / Panasonic slot load / M1-ATX / Bu303 / Sound blaster 24 / PPi amps / rockford sub

  5. #5
    Variable Bitrate The Grinch's Avatar
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    If you have some kind of OBD scan tool that you can tap into, you can apply a forumla to find out your boost.

    (Absolute Pressure (MAP)(in Hg) - Barometric Pressure(in Hg))*.4911540775.

    I have no idea how you would incorporate that in real time.
    Carputer progress meter: [-----|]
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  6. #6
    Newbie stevelangford's Avatar
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    tlak to megasquirt people, software is free an it has a screen where it shows boost, temp etc. maybe you can use potentiometers on the serial connector pins until you can find what triggers boost signal and calibrate from there with a resistor or two

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